Brake-shoe.



No. 788.949. PATENTED MAY 2, 1905. FITZ WILLIAM SARGBNT.

BRAKE SHOE.

APPLICATION FILED FEB. a. 1904.

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Wiiwesses; W 11144 No. 788,949. PATENTBD MAY 2, 1905.

FITZ WILLIAM SARGBNT.

BRAKE S APPLICATION FILED .8 1904.

3 SHEETS-SHEET 3.

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NITED STATES Patented May 2, 1905.

PATENT OFFICE.

FITZ WILLIAM SARGENT, OF MAHWAH, NEW JERSEY, ASSIGNOR TO AMERICAN BRAKESHOE & FOUNDRY COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEWJERSEY.

BRAKE-SHOE.

SPECIFICATION forming part of Letters Patent No. 788,949, dated May 2,1905.

I Application filed February 8, 1904- Serial No. 192,489.

To rtZZ whom it may concern:

Be it known that I, FITZ WILLIAM SARGENT, a citizen of the UnitedStates, residing at Mahwah, in the county of Bergen and State of NewJersey, have invented certain new and useful Improvements inBrake-Shoes, of which the following is a specification.

My invention relates to the wearing blocks or shoes of brakes employedon railway cars and the like, and particularly to the form of brake shoewhich is made of cast metal and is provided with a strengthening backgenerally made of plate steel or other ductile metal. The objects of theinvention are, to provide a superior method of attaching such astrengthening back to a cast shoe; to provide superior lugs forattaching the shoe to the brake head, and superior means for securingthe lugs in the cast metal of the shoe; to provide for making integrallythe strengthening back of a cast shoe and a malleable lug for attachingsaid shoe to the brake head; to provide a superior form of attaching lugwhich will fit tight in place in the brake head and which has a securehold upon the attaching pin or key, and to generally improve andsimplify the manufacture of brake shoes of the kind specified. Theseobjects and other advantages which will hereinafter appear, I attain bymeans of the structure illustrated in preferred forms in theaccompanying drawings, where- Figure l isaplan view of the blank formaking the malleable backing of the shoe, being out ready for punchingup the lug thereon;

FigurefiZ is a side elevation of the same showing in two stages theformation of the malleable lug made from the backing plate;

Figure3 is a central longitudinal section on line 3 of Figure 4, of aform of brake shoe having two attaching lugs formed on the malleablebacking;

Figure 4 is a plan view of the same;

Figures 5 and 6 are cross sections of the brake shoe, taken respectivelyon lines 6 in Figure 3, and 5 in Figure 4:;

Figure 7 is a plan view of another form of backing with an improvedcentral attaching lug formed thereon;

Figure 8 is a central longitudinal section of the malleable backing asformed up, and the outlinesof the head and the shoe shown therein;

Figures 9 and 10 are cross sections, respectively on lines 9 and 10 inFigure 7 showing the malleable metal backing, and the shoe in outline;

Figures 11 and 14 are plans of a modified form of the blank, and

Figures 12, 13 and 15 are central cross sections showing the formationof the lug, in some variations in which the straps for the lugs are bentover from the side of the backing and the eye for the key is laterallyresilient.

In order to overcome the inherent weakness and danger of the ordinarycast brake shoe in heavy service, which results from the structuralweakness of the cast iron body, reinforcing strips or backs formed oftough malleable iron or ductile metal have been placed lengthwise in thebody of the shoe in various posi tions, to strengthen and to hold theparts together in the event of the body cracking when in service. Insuch shoes however, the attaching lugs for fixing the shoe upon thebrake head have ordinarily been made of cast metal or else of separatepieces fixed in the cast metal of the shoe, being usually made integralwith the cast body and projecting through or around the re-inforcingplate or strips forming the back. In such cases not only are these partsweak but the cooling effect on the cast metal at the point where itpasses around or through the apertures of the plate or re-inforcing backhas caused a chilling of the cast metal which increases the shrinkingand danger of cracking the same, so that so far as the lugs areconcerned the cast lugs are weaker than if the shoe did not have themalleable backing. In those cases where a malleable back has been usedand doubled upon itself near the center of the shoe to form the eye lugfor attachment to the head, it results in weakening the shoe at thecenter where the greatest strain comes upon it and is furthermore moreexpensive in using more metal than necessary and fails to support theshoe at the center in case of cracking.

In order to overcome these difficulties I provide a brake shoe whichconsists of a cast body re-inforced by a plate of malleable or" ductilemetal on the back and the attaching lugs are formed by punching up apart of the metal of such back, thereby at the same time providing thelug and an opening through which the cast metal may flow to firmly fixthe backing upon the body. The lug is thus an integral part of thebacking itself. As shown in the figures on Sheet 1 of the drawings, themalleableor ductile back 12, which is preferably made of steel, has thetongues 13 punched out as shown in Figures 1 and 2 and bent upward inthe form shown in Figure 3, whereupon the said back isplaced in the moldand cast metal for the body is poured in, when it will be seen that thecast metal may freely pass through the openings (15) in the back andalso around the ends of the plate and in the openings under the straps13 to form the seats 14 for the brake head, and also to form the centralridge 16. I preferably form the backing with a curved section as shownin Figures 5 and 6, thereby increasing the strength of the back andgiving the outer edges more firm anchorage in the metal of the castbody, 11. It will be seen that in the completed shoe both ends of theloop 13 forming the eye for attachment to the brake head are burieddeeply under the cast metal of the seat 14, and besides, the strap 13 isan integral part of the backing plate 12 and consequently willhold thepieces of the shoe together in case of breakage of the cast metal, andcannot itself come loose from any part.

In the figures on Sheet 2 I have shown a diflerent form of the backingfor shoes, in which there is used a center lug. In this it will be seenthat the back 12 is punched with two end openings 15 for the flow of thecast metal therethrough,and the central attachinglug is made by punchingout two lips 17 and bending them up in the form shown clearly in Figure8. A central opening 23 may also be punched in order to give a moresecure hold upon the cast body, and the backing may be made either flator in the curved form as shown in Figures 9 and 10. It will be seenthatthese two upward bent lips 17 are provided with openings 19 for thereception of brake shoe key 22 when placed in the head 20 of the brakebeam, and by reason of the formation of the two sides 17 of the lugs sothat they incline with respect to each other it will be seen that thelugs may be sprung and forced in to fit tightly and maintain by theirresiliency a tight fit within the two side lugs 21 of the brake head,while at the same time the top or overhanging edges 17 of the sides 17may abut against the base of the seating notch andhere again may insureby their resilience the lugs remaining tightly in place in the brakehead and on the key 22. I regard this as a very important advantage notonly because it gives a firm hold of the lugs upon the brake shoe keybut because it entirely obviates the rattling of the shoe on its seatiithar vertically or laterally upon the brake It will be understood ofcourse that when so desired the cast metal of the body 11 may be runentirely over and around the plate 12 connecting with the parts that runthrough the openings 15 and 23, so that while the lug is integral withthe back of the shoe it does not in any respect interfere with theanchorage of the said backing within the shoe, and no part of the shoecan fall out in case of breakage. Two lugs in position as in Figure 3may of course be made in the form of Figure 8 when so desired. And itwill be under-- stood that the improvement of the double strap lug 'asshown in Figure 8 may be applied as well to a flange brake shoe or anyother form of shoe; and this feature may be combined with the feature ofelasticity in the size of the attaching lug in order to fit in the notchin the brake head, whatever the form of shoe may be. Also, by the formof the two-part resilient lug 17, in the act of driving the key intoplace the sides may vary in their inclination and in the form of theopening therein to accommodate the key as well as the notch into whichthe attaching lug is inserted. The construction of the lug may be variedby forming a strap or pair of straps bent over from the side of thebacking as shown on Sheet 3 of the drawings. Thus in Figure 11 the blankis provided with laterally projecting straps 2 1 which when bent overform the lug as in Figure 12; or the two parts may be lapped over eachother as in Figure 13. The cut is preferably made deep enough to formrecesses 25, when the straps are bent up. The blank in Figure 1 1 has aa single long strap, 24:, which is bent over as in Figure 15 with theend lying in the cut out notch 25 therein, making the complete lug 26with both ends anchored. In all the forms the lug is integral with theback and is resilient. The Various advantages of these devices will bereadily apparent.

Having thus described my invention and illustrated its use, what I claimas new, and desire to secure by Letters Patent, is the following:

1. A brake shoe having a resilient compressible attaching lug thereon.

2. A brake shoe having a resilient attaching lug formed in twounconnected parts.

3. A brake shoe having an attaching lug whose sides are inclined, freeat one end, and laterally resilient.

4. A brake shoe having an attaching lug with its sides and top formed ofresilient freeended members.

5. A brake shoe having a two part attachl and amalleable backing, saidbacking having ing lug composed of two projecting unconnected spurs andresilient both laterally and vertically to the brake head, substantiallyas described.

6. A brake shoe having a malleable metal backing and a resilientattaching lug with compressible sides.

7. A cast brake shoe provided with a malleable strengthening back, andsaid back having integral therewith a resilient attaching lug composedof two separate parts.

8. A brake shoe having an attaching lug composed of two perforatedmembers having free ends, substantially as described.

9. A strengthening back for brake shoes comprising a continuous plate ofmalleable metal having attaching lugs for the shoe formed by punchingout parts of said metal.

10. A malleable plate' backing for brake shoes having thereon anattaching lug for the brake shoe formed of lips punched out of saidmetal and bent up and provided with means for resiliently engaging thebrake head.

11. A brake shoe back comprising a plate of ductile metal having lipspunched out of the same and bent upward to form a resilient attachinglug, and having their ends free.

12. A brake shoe comprising a cast body, a ductile metal backingembedded in said body, and parts of said backing being punched out andbent upward to form attaching lugs, the

bases of said punched-out lips being buried in the cast body of the shoeand the upper ends free.

13. A brake shoe comprising a cast body free-ended tongues punched outand integrally fixed thereto, anchored in the body and forming anattaching lug for the shoe.

14:. In a brake shoe a malleable backing therefor having the integralpunched-out and upturned lips 17, bent to incline toward each other butnot touching, and perforated to receive the brake shoe key.

15. The combination with the brake head, of a brake shoe having anattaching lug formed of two resilient lips, whereby the attaching lugmay be sprung into the opening in the brake head.

16. The combination with the brake head, of a brake shoe provided with apair of upwardly bent resilient lugs thereon inclined toward each otherand adapted to resiliently engage both the sides and the bottom of thenotch in the brake head and perforated to receive the brake shoe key,substantially as described.

17. In a brake shoe the combination of the cast body, the malleable backtherefor, the attaching lug formed of the two punched out and upturnedlips 17 said lips being inclined toward each other and having turnedover ends 17 to engage the bottom of the notch in the brake head,substantially as described.

In testimony whereof I have hereunder signed my name in the presence ofthe two subscribed witnesses.

FITZ VVILL'IAM SARGENT.

Witnesses:

W. C. CHIPrs, H. A. CAs'roR.

